package com.heima.admin.gateway.filter;

import com.heima.admin.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
public class AdminFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取request，response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断此次请求是否包含登录
        if (request.getURI().getPath().contains("/login")){
            return chain.filter(exchange);
        }
        //获取token
        String token = request.getHeaders().getFirst("token");
        //判断token是否存在
        if (StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //判断token是否有效
        Claims claims = AppJwtUtil.getClaimsBody(token);
        int result = AppJwtUtil.verifyToken(claims);
        if (result==1&&result==2){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //解析token获取用户id
        String userId = claims.get("id").toString();
        //对request请求做一个增强,添加一个用户id的键值对
        ServerHttpRequest build = request.mutate().headers(httpHeaders -> httpHeaders.add(userId, "")).build();
        // 替换旧的request对象
        exchange.mutate().request(build).build();
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
